I had those assholes try to build a nest above my garage door. The first time, it was about golf ball sized so I just took a shovel and smushed it along with the 2 or 3 pricks who were building the nest. a few days later, the shitheads were trying again in the same spot, so I went and got a can of wasp & hornet spray, and gave it a good blast. within ten seconds or so, the bastards went into a wonderful seizure and dropped to the ground.